Effects of lodine in Various Formulations on the Growth of Barley and Pea Plants in Nutrient Solution Culture

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Abstract
The forms of iodine added to cultures of barley were potassium iodide, potassium iodate, potassium periodate, and iodoacetic acid at iodine concentrations of 1.0 ppm and 10.0 ppm. With pea, only iodide and iodate at 1.0 ppm iodine concentration were used. For both species, comparisons were made with cultures to which no iodine was added. In barley, growth was increased by 1.0 ppm iodine, the relative effectiveness of the different formulations being in the order: iodoacetic acid > iodide > iodate > periodate. With 10.0 ppm, iodide and iodoacetic acid treatments gave reduced growth, iodate was without effect, and periodate enhanced growth. In pea, 1.0 ppm iodine was inhibitory, iodide being more toxic than iodate. Analysis of dry matter showed iodine content according to treatment to be in the order: iodide > iodoacetic acid > iodate > periodate

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